Aerosol Particle Concentration Determined Using an Acoustic Transducer

Analysis of dilute aerosol flow and noise generation in an acoustic transducer

“…Chen and Mills (2001) reported differences of up to 40% between concentration measurements taken by the acoustic transducer and by laser-based particle sizers. In the present study, concentration was measured simultaneously by the transducer and by an APS 3321 particle sizer (TSI Incorporated).…”

“…More recently, a series of articles (Chen, Chaos, Haddad, & Mills, 2004;Chen & Mills, 2000, 2001Mills & Chen, 1999) demonstrated the ability of an acoustic transducer ( Fig. 1) to detect particles of different sizes (down to 6 m) and differentiating fiber shapes with large aspect ratios.…”

“…1) to detect particles of different sizes (down to 6 m) and differentiating fiber shapes with large aspect ratios. Preliminary investigations were carried out on the accuracy of the transducer in measuring particle concentration (Chen & Mills, 2001). It was concluded (Chen et al, 2004) that the sound generated as particles were accelerated through the transducer was not due to any shock wave phenomena.…”

“…Effort is placed in determining the particle detection ability of the transducer as a function of particle size and system flow rate. Since the transducer is very effective in measuring low particle concentrations (Chen & Mills, 2001), a correlation is also sought between the concentration measured by the acoustic transducer and that measured by a commercially available aerodynamic sizer (TSI Incorporated). Furthermore, the location of the acoustic source is identified, for the first time, with the help of a computational model taking into account airflow compressibility effects.…”